This little bird doesn't look like much, but they're extremely cool. This is the Puna Ground Tyrant. He's named for the region of the Andes where he lives called the Puna, which is in the high-high mountains (above 3,600 meters!). There aren't a lot of other birds around up there, so he doesn't have much competition for attention...there's a few other members of his Genus who also hang around up high. They're apparently called "tyrants'' because they're pretty nasty to their food, although I never got to see it.
I took this picture in the Puna somewhere outside La Paz on July 7, 2012.